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Fix identity-entry filter miscounting non-BMP characters as multi-char - #50
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k.length counts UTF-16 code units, so a single character above U+FFFF (e.g. 𪙏) reports length 2 and its self-mapping entry survives the "char => same char" filter meant to trim redundant dictionary rows. Switch to a code-point count via [...k].length. Fixes nk2028#49
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k.length counts UTF-16 code units, so a single character above U+FFFF (e.g. 𪙏) reports length 2 and its self-mapping entry survives the "char => same char" filter meant to trim redundant dictionary rows. Switch to a code-point count via [...k].length.
Fixes #49